修正 PHP 代码部分错误

Author: ttttonyhe

8.countingSort.md

@@ -149,7 +149,11 @@ function countingSort($arr, $maxValue = null)
 
     $sortedIndex = 0;
     foreach ($bucket as $key => $len) {
-        if ($len !== null) $arr[$sortedIndex++] = $key;
+        if($len !== null){
+            for($j = 0; $j < $len; $j++){
+                $arr[$sortedIndex++] = $key;
+            }
+        }
     }
 
     return $arr;